*edit* the mailing lists are reporting a possible client side update has fixed this issue about an hour ago, can anyone confirm?

Im also having this exact same issue, server crashing at random times, as well as lag "spikes" that lasts for half a second or so. Im running tf2 servers at the same time that are not suffering from this at all.
This is on the 2.6.29.1 kernel, non-RT patched, 1000HZ, all power management disabled but acpi left on. Also happening on 2.6.27.11, on different hardware, all intel xeons.